J16193+2955sdB

SDSSJ161921.70+295506.1 · 16:19:21.70 29:55:06.10 · Culpan knownhsd

χ²/N = 1.00

Spectrum

shaded: the intervals the fit used · │ a cancelled pixeldrag on either panel to zoom · dbl-click or Esc to reset · arrows to pan

The whole reduced spectrum above, the region marked on it below. Shaded bands are the intervals the fit used; a tick under the axis marks a pixel the rejection mask cancelled.

Line-profile fit — Bamberg

Observed spectrum in black, model in red, offset by line. Balmer series left, helium right.

Results and provenance

Fit — Bamberg

T_eff [K]	34580 ± 424
log g	5.794 ± 0.058
log n(He)/n(H)	-2.102 ± 0.069
reduced χ²	1.004 over 639 points
radial velocity	42.0 km s⁻¹
resolution (FWHM)	2.50 Å
lines fitted	12
grids	HE-0.041.fits HE-0.125.fits HE-0.300.fits HE-0.550.fits +9 more
fitted	04/09/2026 18:32:03

Fit — Lei (TLUSTY)

T_eff [K]	33060 ± 290
log g	5.930 ± 0.130
log n(He)/n(H)	-2.120 ± 0.140
grids	Lei et al. 2019, ApJ 881, 135 SYNSPEC 49 spectra from NLTE TLUSTY 204 model atmospheres, through XTgrid

Observation

cosmic rays	6 pixels cancelled
S/N (classifier)	53.0
source file	spec-57898-HD161644N290900M02_sp09-165.fits.gz

Gaia astrometry

Gaia DR3 source	1318236621192489216
parallax [mas]	0.3727 ± 0.0569
G	16.843
G_abs	4.615
μ_α [mas/yr]	1.728
μ_δ [mas/yr]	-9.519
l, b	49.294, 44.631

Published (Culpan et al. 2022)

class (Culpan)	sdB
class (SIMBAD)	sdO
T_eff [K]	34115 ± 933
log g	5.79 ± 0.15
log y	-2.00 ± 0.20
reference	2017OAst...26..164G

Classifier

AGREES

fitted Teff 34115 logg 5.79 logY -2.0 2017OAst...26..164G

auto: contrast 0.03, within the 0.25 a subdwarf reaches at 31 kK, Mg I b suggests a companion but Ca II does not (-0.7 sigma)

Fitted lines

line	λ [Å]	shift [Å]	continuum at	±avg	fitted over
H_β	4861.32	0.68	-40.0, 40.0	5.0	-45.0, 45.0
H_γ	4340.46	0.61	-40.0, 36.8	4.5	-43.0, 43.0
H_δ	4101.73	0.57	-40.0, 31.6	4.2	-43.0, 43.0
H_ε	3970.07	0.56	-28.0, 30.0	4.1	-30.0, 35.0
H_ζ	3889.05	0.54	-20.0, 26.2	4.0	-31.8, 32.0
H_η	3835.38	0.54	-20.0, 14.6	4.0	-20.7, 21.8
H_θ	3797.90	0.53	-16.0, 16.0	3.9	-15.6, 16.7
H_ι	3770.63	0.53	-13.0, 13.0	3.9	-11.7, 11.6
He II 4686	4685.70	0.66	-11.9, 11.9	4.9	-15.0, 13.8
He I 4472	4471.60	0.63	-15.0, 15.0	4.6	-15.0, 15.0
He I 4026	4026.29	0.56	-24.2, 15.0	4.2	-15.0, 15.0
He I 4922	4921.93	0.69	-15.0, 15.0	5.1	-15.0, 15.0